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Palaeoposition of the Seychelles microcontinent in relation to the Deccan Traps and the Plume Generation Zone in Late Cretaceous–Early Palaeogene time

By
M. Ganerød
M. Ganerød
Geodynamikk, Geological Survey of Norway, NO-7491 Trondheim, Norway
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T. H. Torsvik
T. H. Torsvik
Geodynamikk, Geological Survey of Norway, NO-7491 Trondheim, NorwayPhysics of Geological Processes (PGP), University of Oslo, P.O. Box 1048, Blindern, NO-0316 Oslo, NorwayCenter for Advanced Studies, Norwegian Academy of Science and Letters, Drammensveien 78, NO-0271 Oslo, Norway
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D. J. J. van Hinsbergen
D. J. J. van Hinsbergen
Physics of Geological Processes (PGP), University of Oslo, P.O. Box 1048, Blindern, NO-0316 Oslo, NorwayCenter for Advanced Studies, Norwegian Academy of Science and Letters, Drammensveien 78, NO-0271 Oslo, Norway
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C. Gaina
C. Gaina
Geodynamikk, Geological Survey of Norway, NO-7491 Trondheim, NorwayPhysics of Geological Processes (PGP), University of Oslo, P.O. Box 1048, Blindern, NO-0316 Oslo, NorwayCenter for Advanced Studies, Norwegian Academy of Science and Letters, Drammensveien 78, NO-0271 Oslo, Norway
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F. Corfu
F. Corfu
Department of Geosciences, University of Oslo, Pb 1047 Blindern, NO-0316 Oslo, Norway
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S. Werner
S. Werner
Physics of Geological Processes (PGP), University of Oslo, P.O. Box 1048, Blindern, NO-0316 Oslo, Norway
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T. M. Owen-Smith
T. M. Owen-Smith
School of Geosciences, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
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L. D. Ashwal
L. D. Ashwal
School of Geosciences, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
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S. J. Webb
S. J. Webb
School of Geosciences, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa
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B. W. H. Hendriks
B. W. H. Hendriks
Geodynamikk, Geological Survey of Norway, NO-7491 Trondheim, Norway
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Published:
January 01, 2011

Abstract

The Early Palaeogene magmatic rocks of North and Silhouette Islands in the Seychelles contain clues to the Cenozoic geodynamic puzzle of the Indian Ocean, but have so far lacked precise geochronological data and palaeomagnetic constraints. New 40Ar/39Ar and U–Pb dates demonstrate that these rocks were emplaced during magnetochron C28n; however, 40Ar/39Ar and palaeomagnetic data from Silhouette indicate that this complex experienced a protracted period of cooling. The Seychelles palaeomagnetic pole (57.55°S and 114.22°E; A9512.3°, N=14) corresponds to poles of similar ages from the Deccan Traps after being corrected for a clockwise rotation of 29.4°±12.9°. This implies that Seychelles acted as an independent microplate between the Indian and African plates during and possibly after C27r time, confirming recent results based on kinematic studies. Our reconstruction confirms that the eruption of the Deccan Traps, which affected both India and the Seychelles and triggered continental break-up, can be linked to the present active Reunion hotspot, which is being sourced as a deep plume from the Plume Generation Zone.

Supplementary material:

Experimental data are available at http://www.geolsoc.org.uk/SUP18482.

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Geological Society, London, Special Publications

The Formation and Evolution of Africa: A Synopsis of 3.8 Ga of Earth History

D. J. J. Van Hinsbergen
D. J. J. Van Hinsbergen
University of Oslo, Norway
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S. J. H. Buiter
S. J. H. Buiter
Geological Survey of Norway
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T. H. Torsvik
T. H. Torsvik
University of Oslo
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C. Gaina
C. Gaina
Geological Survey of Norway
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S. J. Webb
S. J. Webb
University of the Witwatersrand, South Africa
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Geological Society of London
Volume
357
ISBN electronic:
9781862396050
Publication date:
January 01, 2011

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